Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddda4af18ac5370…

MALICIOUS

PDF

80.8 KB Created: 2021-08-17 21:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1c260b2ec4c2266c44dc46495d1150b7 SHA-1: 5ba801b4910d6d3a53eccb7bbad98bea9d9eda07 SHA-256: bddda4af18ac5370d282d75632d2bc2c2a4ebf63288e9daa61aeb03b4930b385
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of embedded JavaScript indicates potential for further malicious actions, such as exploiting browser vulnerabilities or downloading additional payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://tele-video.ru/upload/files/salasusopulemu.pdf In PDF document text
    • http://studiolorenzoni.eu/userfiles/files/vudimos.pdfIn PDF document text
    • http://alliance-ltd.com/userfiles/xaxogejupelebivegebesoro.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16091143b0095d---fobesedajisoxapoza.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/kolanibit.pdfIn PDF document text
    • http://mundori.com/js/ckfinder/userfiles/files/liwabawoj.pdfIn PDF document text
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d30206b44d---tebudanudefa.pdfIn PDF document text
    • https://bilalyapidekorasyon.com/userfiles/file/17676725007.pdfIn PDF document text
    • http://hyundainhapkhau.net/upload/files/39532957853.pdfIn PDF document text
    • http://bfo-walkforhope.com/clients/e/eb/ebd0efab9cd97e953e90891d9eec7aad/File/8062194172.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/82999390149.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b14df0fd31b2065a4936d666d8df022/biverijafaxegogexotakilu.pdfIn PDF document text
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a7bcd82b25---fofuxop.pdfIn PDF document text
    • https://prestinireedcorp.com/userfiles/files/velujazajogowatetudew.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/92512184068.pdfIn PDF document text
    • http://scantech3d.com/files/kefupugow.pdfIn PDF document text
    • https://allianztc.ro/files/file/2752919497.pdfIn PDF document text
    • https://pypconsultores.mx/userfiles/file/12793014687.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/160e11e48aedab---29848464568.pdfIn PDF document text
    • http://gintaras.cz/userfiles/file/vewuromodos.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/momexiwepowuwamodimonavof.pdfIn PDF document text
    • http://phrabat.net/UserFiles/File/35572127446.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///14332979653.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=pathophysiology+book+by+harsh+mohan+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d770.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD770 11160 bytes
SHA-256: d58086c805e3a483328612ed3a974ec5e25ae1f4dbe75767fc3f07b3f0f9b6ef
font_01_sfnt_off0000f0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EF 16684 bytes
SHA-256: 6223c37bc5a4204c037be3e3c7058395d09ca28fca19735a29acd834aa70aa36
font_02_sfnt_off00011c0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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